摘要
传统船体外板加工过程中,钢板形状由工人利用手工卡样板或样箱进行检测,单纯依靠工人的经验主观评价成型效果,存在评价标准不规范以及评价稳定性较差的问题,为此提出船体外板曲面成型效果量化评价方法。该方法首先利用相同的坐标变换算法,对目标模型和钢板点云数据进行处理,使得目标肋骨线和钢板肋骨线能够在同一坐标系中综合分析。然后拟合每条肋骨线的最小二乘曲线,求取肋骨线关键点在该曲线表示下的曲率。最后对比分析目标肋骨线和钢板肋骨线的曲率分布情况,计算成型效果系数。通过广船国际船体外板加工过程的实际应用,表明该算法能够利用肋骨线代替点云数据描述钢板特征,综合分析肋骨线关键点的曲率信息,获得成型效果实现量化评价。
Generally, the shape of a steel plate is detected manually by clamping the sample board or case in hull plate processing and the machining effect is assessed by the workers＇ experience, thus leading to improper evaluation criteria and poor evaluation stability. A quantitative evaluation method for hull plate formation has been proposed to solve these problems.First, the same algorithm of coordinate transformation is used to process the target model and the point cloud data of hull plates so as to ensure that the targeted frame line and the steel plate rib line could be analyzed in the same coordinates. Second, the least-squares curves of each frame line are to get the curvature of the key points on the frame line expressed by the said curve. Then,the curvature distribution of the targeted frame line and the steel plate frame line are comparatively analyzed to calculate the coefficient of the shaping effect. The practical applications in hull plate processing at Guangzhou Shipyard International Company Limited indicates that with this method the frame line instead of point clouds can be used to describe the features of hull plates and the curvature information of the key points on the frame line can be comprehensively analyzed to evaluate quantitatively the molding effect of hull plates.
出处
《中国测试》
CAS
北大核心
2016年第4期20-24,共5页
China Measurement & Test
基金
国家自然科学基金广东省联合基金重点项目(U2012A002D01)
关键词
船体钢板
点云数据
坐标变换
最小二乘法
量化评价
hull plate
point cloud
transformation of coordinates
least squares method
quantitative evaluation
